VHFDesign – Amateur radio development team

Skip to content [#content] VHFDesign Amateur radio development team Main Menu Our team US4ICI US2IDR UR3IQO UR7IJM UR6ISU KITs FAQ KITs list Assembly request Guides How to pay with Paypal guide Custom order Join us How to become an author? About us Contacts Search Search for: PA 23cm 300 Watt pallet with controller Power amplifiers / By US2IDR PA 23cm assembly KIT for your own power amplifier assembly. Sequencer with CW memory keyer Other / By UR3IQO Automatic CW keyer, 4-channel sequencer and simple computer interface for PTT switching and CW manipulation. PA controller Power amplifiers / By US4ICI The device provides operation control and protection of the power amplifier. LO PLL USB MAX2871 ADF4350 ADF4351 PLL-LO / By UR3IQO Small PLL USB mudule. LO PLL ADF4350 PLL-LO / By US4ICI Developer: US4ICI PLL contains 2200 — 4400 MHz VCO. VCO frequency divider (multiple of 1/2/4/8/16) allows to synthesize frequencies from 137.5 MHz to 4400 MHz. A good phase noise (approximately -100 dBc/Hz, 10 kHz at a frequency of 1152 MHz). This development designed to be used as SHF LO (beacon, transverter) at a fixed frequency. … LO PLL ADF4350 Read More » PA 23cm 1296 MHz MRFE6S9160 150 Watt Power amplifiers / By US4ICI Developers: US4ICI & US2IDR Technical specifications Model: PA-23cm-150W-N-female Based on MRFE6S9160HS transistor RF Range: 1260 — 1300 MHz P input TX < 6 Watt Pout = 150 Watt (JT65, FM) Pout = 180 Watt (CW, SSB) Supply operation: 28 V DC at IDQ = 12 A (TX) Impedance: 50 ohms RF connectors: N-female Dimensions: 100 … PA 23cm 1296 MHz MRFE6S9160 150 Watt Read More » QRO LNAs with built-in bypass relays for 6m, 4m, 2m, 1.25m and 70cm bands LNA / By US2IDR QRO LNA lineup is presented in this project. This is a cooperative project of US4ICI and US2IDR. LNAs don’t contain RF VOX, power through the feeder is not provided. The solutions for other frequency ranges (6m, 4m, 2m, 1.25m and 70cm) are also available. LNAs complectation is available with N-female input and output connectors only. … QRO LNAs with built-in bypass relays for 6m, 4m, 2m, 1.25m and 70cm bands Read More » Transverter MICROSTRIP 5,76 GHz – 435 MHz V.2 Transverters / By UR6ISU Transverter is built on a classical scheme with synthesizer usage. Specifications Model: TRCV-6cm-70cm RF: 5760 MHz LO: 5325 MHz (by default) IF: 435 MHz (by default) Reference oscillator frequency stability (0 … 70 °C): typ. 0.2 ppm max PLL SSB PN @ 10 kHz Offset: -109 dBc/Hz Output power: > 13 dBm IF input power: … Transverter MICROSTRIP 5,76 GHz – 435 MHz V.2 Read More » LNAs with built-in bypass relays and RF VOX for 4m 2m 1.25m 70cm bands LNA / By US4ICI In this project we are present a new version of the LNA with bypass relays and RF VOX. This construction is different from the previous version. It has different bypass relays (up to 100 Watts) and RF transceiver control circuit. Area of the application is utilization of the FM transceivers and radio stations (LPD, PMR). … LNAs with built-in bypass relays and RF VOX for 4m 2m 1.25m 70cm bands Read More » High OIP3 LNA EME ATF-531P8 with BPF filter for 2m 70cm bands LNA / By US4ICI In this project we created all-purpose LNAs for all QSO types (Tropo, Contest, EME, etc.) for 2m and 70cm bands. LNA was designed using ATF-531P8 E-pHEMT with High IP3 (37 dBm). Noise figure is much better than on PGA103+ or SPF5189z for 2m band (< 0.2dB). ATF-531P8 E-pHEMT is more reliable than low power ATF-54143 … High OIP3 LNA EME ATF-531P8 with BPF filter for 2m 70cm bands Read More » Sequencer PCB for LNA, PA, RF-Relays, Transceiver Other / By US4ICI This sequencer is designed for CO-OP work with VHF radio equipment including transceiver, PA and LNA. The main device’s assignment – ensure the inclusion order of devices listed above with correct order and delays. The circuit solution basis was taken from W6PQL. Some changes were applied to the scheme. This changes allow to use the … Sequencer PCB for LNA, PA, RF-Relays, Transceiver Read More » SHF Ultra Low Phase Noise PLL Hittite Microwave PLL-LO / By US4ICI В этой заметке представлена разработку синтезатора частоты для СВЧ с низкими фазовыми шумами на МС фирмы Hittite Microwave с интегрированным ГУН. Технические характеристики PLL HMC820LP6: Fout: 1095 – 1275, 2190 – 2550, 4380 – 5100 MHz; SSB PN @ 10kHz Offset: -118, -112, -106 dBc/Hz. Технические характеристики PLL HMC840LP6: Fout: 1310 – 1415, 2620 – … SHF Ultra Low Phase Noise PLL Hittite Microwave Read More » LNA 70cm for SAV-541+ LNA / By US4ICI The new ultra low-noise pmplifier LNA-70cm-SAV-541+ is present to your attention. Technical specifications of the LNA-70cm-SAV-541+ Model: LNA-70cm-SAV-541+ Active element: SAV-541+ Gain: 18 dB Noise Figure: < 0.3 dB Output IP3: 33 dBm BW(-3 dB): < 40 MHz DC voltage: 8 – 13.8 V DC current: 40 mA Impedance: 50 ohms RF connectors: N-female или … LNA 70cm for SAV-541+ Read More » LNA for 23 cm band (based on MMIC SKY67151) LNA / By US4ICI The prototype of new LNA was the previous design made on IC MGA633P8 two years ago. The HPF and LPF filters previously were made on LC components and then been replaced to LFCN-1200 and HFCN-1200 filters from Mini-Circuts. Technical specifications of two-cascades LNA 23cm Model: LNA-23cm-EME Based on: SKY67151 (1st cascade) and PGA-103+ (2nd cascade) … LNA for 23 cm band (based on MMIC SKY67151) Read More » SHF converter Measurements / By UR6ISU Переносчик спектра СВЧ сигнала У вас возникали проблемы и вопросы при настройке СВЧ аппаратуры? Уверен, кто хоть раз сталкивался с настройкой СВЧ конструкций задумывался о приобретении анализаторов СВЧ цепей. Речь идет о частотах выше 1,3 ГГц. Сегодня нам стали доступны анализаторы спектра до 1- 1,5 ГГц. Но, что быть, если вам захотелось “выше”? LNA with the bypass relay and RF VOX LNA / By US4ICI This LNA is assembled based on chip MMIC SPF5122z. HF356 AXICOM relay is used for path tracing. The main distinction from previous designs consists in RF VOX availability (HF voltage detector in the output of LNA). Such decision allows protecting amplifier from random transmitter power feed to their output. RF VOX functions correctly in CW, … LNA with the bypass relay and RF VOX Read More » PA 23cm Power amplifiers / By UR7IJM В этом совместном проекте UR7IJM и US4ICI, реализована давняя идея сделать усилитель мощности на диапазон 1296 MHz, на доступном транзисторе, не сложный в настройке. Усилитель представляет собой плату размером 90×70мм, изготовленную из двустороннего фольгированного материала FR-4 толщиной 1мм с металлизацией отверстий. В качестве активного элемента усилителя используется транзистор MRF286. Даташит на него можно найти по … PA 23cm Read More » Wilkinson power bridge 432 MHz Power amplifiers / By UR7IJM Здесь описан очередной совместный проект UR7IJM и US4ICI мост Вилкинсона, предназначенный для деления/суммирования мощности в диапазоне 432 MHz. Мосты рассчитаны и изготовлены в двух исполнениях, одно из которых используется в качестве делителя мощности, другое – в качестве сумматора. Рассмотрим делитель. Данный мост представляет собой плату размером 80×30 мм. В качестве материала для платы был выбран … Wilkinson power bridge 432 MHz Read More » Практика применения LNA в тропосферной связи. LNA / By US4ICI После ПД 2011 удалось провести эксперименты с МШУ 144 МГц с двумя реле обхода на SPF5122z. МШУ был установлен на UT3IWA вблизи антенны (два ряда по 7 эл, вертикально), фидер 35 метров RG213, трансивер FT847 (Кш=2.4 кТ). LNA NF=0.8 dB Место приема характеризуется изобилием помех в виде широкополосного шума, достигающего с отдельных направлений уровня S7 … Практика применения LNA в тропосферной связи. Read More » LNA 144/430 MHz на MMIC SPF5122Z LNA / By UR7IJM LNA 144/430 MHz на MMIC SPF5122Z The new project of US4ICI and UR7IJM is given for your attention. It is a low noise amplifier for 144 or 430 MHz bands. This amplifier particularity is that it has built on base of one chip which amplification is enough for the proper functioning of system antenna-LNA-feeding cable-transceiver. … LNA 144/430 MHz на MMIC SPF5122Z Read More » Posts navigation 1 2 Next Page → English Russian Categories Other (2) Measurements (2) LNA (12) PLL-LO (4) Transverters (2) Power amplifiers (7) Copyright © 2019 VHFDesign